The BBC gardening board I visit has come up wit this question. It's an interesting bit of activity - anyone know much about wasps?
"We have had wasps nesting all summer in a pile of turves which have been left to rot down to form loam. They have been a godsend as we have had no aphids or other pests on the crops. However, we have now observed many of the remaining wasps carrying white grubs or pupae out of the nest opening, and travelling on foot about two or three metres then depositing them on the ground. I can't find anything to explain this. What are they up to?"
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